What is the primary function of the return venturi in a fuel system?

The primary function of the return venturi in a fuel system is to measure the flow rate. The return venturi operates on the principle of the Venturi effect, where a fluid's pressure decreases as it flows through a constricted section of a pipe. In this context, the return venturi is strategically placed within the fuel system to allow for accurate monitoring of how much fuel is being returned to the tank.

By determining the flow rate, the system can help maintain optimal fuel levels and ensure proper functioning of the engine or equipment being supplied with fuel. Measurement of flow rate is essential for effective fuel management, ensuring that the system operates efficiently and safely.

Other options may relate to different functionalities within a fuel system, but they do not accurately describe the specialized role of the return venturi, which is fundamentally about flow rate measurement.